Bug description

Prebuilds are succeed but dashboard state shows they are FAILED. See also internal chat

Steps to reproduce

• Create Project for repo https://github.com/mustard-mh/test/blob/main/.gitpod.yml or any repo that contains task like this.
• Trigger Prebuild in dashboard, after it completed and refreshed, prebuild status is FAILED

Anything else?

Maybe related to ws-manager doesn't check ExitCode